US Bridges

Road 208 over Porter Slough

Good

Tulare County, California · 0.47 MI S of Ave 176 · Structure no. 46C0293

Built
1941
84 years old
Condition
Good
inspected February 2025
Type
Slab
Concrete Continuous
Length
35 ft
2 main spans
Daily traffic
700
1978 count
Owner
County
County Highway Agency

About this bridge

Road 208 over Porter Slough is a concrete continuous slab carrying Road 208 over Porter Slough in Tulare County, California. It was built in 1941, so it is 84 years old, older than the California average of 54.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 700 vehicles a day, roughly 10% of them trucks, projected to reach 908 by 2047. The structure is 35 ft (10.7 m) long and 26 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

CarriesRoad 208
CrossesPorter Slough
Location0.47 MI S of Ave 176
RouteCounty Highway 0
Coordinates36.10246, -119.10759
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionFebruary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating40.7 US tons
Inventory rating24.3 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadUnknown
Structure length35 ft (10.7 m)
Longest span17 ft (5.2 m)
Deck width26 ft (7.9 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic700 (1978)
Projected traffic908 by 2047
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Road 208 over Porter Slough built?

It was built in 1941, making it 84 years old in 2025.

What condition is Road 208 over Porter Slough in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in February 2025.

How much traffic does Road 208 over Porter Slough carry?

About 700 vehicles per day (1978 count), of which roughly 10% are trucks.

How long is Road 208 over Porter Slough?

The structure is 35 ft (10.7 m) long with a longest span of 17 ft (5.2 m) and a deck 26 ft wide.

Who owns Road 208 over Porter Slough?

It is owned by the County Highway Agency.